Composite leather belt.



C. E. CARPENEK COMPOSITE LEATHER BELT.

APPLlcATxoN msn DEc.1,1914.

1,160,64@ atened Nov. 9, 12H5 YEGE TABLE. THNNEl CHARLES E. CABPENTR, OF PHILADELPHIA, PENNSYLVANIA.

COMPOSITE LEATHER BELT.

Sp ecificationof Letters Patent.

Patented Nov. 9, 1915.

Application filed'December 7, 1914. Serial No. 875,894.

To all 'zc/0m it may concern.

lie it known that I, Cin-muss E. CR- rnxri-ta, a eti'ften ot' the United States,'re siding in Philadelphla, Pennsylvania, have in\ ented certain improvements in Composite Leather lielts, of which the; following is lil specification.

M v invention relates to composite or builtup belts ot leather; and the/object of my invention is to provide an improved belt ofl stronger and more supple and y.elding than j leather made by vegetable ta'nnage, 1t 1s also susceptible of greater stretch hence, except in the case of ver)l heavy hides, a belt made wholly of mineral tanned leather is liable to stretchexcessiiely and to narrow to such an extent. as to substantially,destroy its \alue when employed as a belt or for similar purposes. Vegetable tanned leather, on the other hand, is much stiffer, has. rela.- tlvely little stretch with no tendency to narrow in use,`but lacks` supplencss and tends to crack onvthe grain side when passing around small pulleys. By combining these refpective mi' imurored composite belt, I take advantage ot' the qualities which make them vperliailivaluable and produce a belt that pailakes of or possesses the virtues of both kinds nl leather and a vo'tdsthcir deliciencies.

ln the use ot leather belts there arc .ti1nes and roudfticns when a tight hold i grip upon the puller. without slippage, is absolutrl." essential to the proper operation of the belt. Under other conditons itis of material :nhmiL'age to' a certain amount of slip to occur; there being some instances where it is absolutely necessary that the belt should slip at intervals in order that the proper operation of the structure.4 with which it is used mavA be effected,v Inusing mv two-plv composite belt, therefore, the

mineral-tanned side may be in,engager nentl with the pulley where no slip is required leathers in the making ofV or desired, and the vegetable tanned leather may be in engagement with the pulley when conditions reipnre or it is desired that slip shall take place between the belt and the pulley. Further, by the use of a layer of mineral tanned leather l 'am able to vsecure a better adherence to the pulley and etiect a considerably greater pull per square inch of contact wtth the pulley than under the best conditions with belts made of vegetable tanned leather. Should slip occur when the m.neral tanned leather side ot' the belt is in contact with the pulley, there will be less danger ot' bui-nhg, since the mineral tanned leatner is capable of withstanding a temperature cons derably higher than leather tanned by any of the vegetable processes.

rlhese and other features ot' my invention are more fully described heregnat'ter, reference being had to the accompanying drawings, in which:

r'igure l, is a sectional view of an ordinary composite belt; made wholly ot' vegetable tanned leather; Fig. 2, isa similar seotional view ot a two-ply composite belt made in accordance with my invention; Fig. t3, is a sectorial view ot' one form ot' threeply composite belt made in accordance with my in.ent.on, and Pig. al, is a sectional view ot' another form of three-ply composite belt made in accordance with my invention.

In Fig. l, wh.eh shows a section of an ordinary composite leather belt as heretofore made, the grain sides ot' the two layers l, l, of vegetable tanned leather form the outer or external surfaces ot' the belt, while the flesh sides or surfaces are secured together by any suitable cement that will insure proper engagement and contact throughout their` length and produce a structure of the desired characteristics and capable of performing the desired functons.

In Fig. 2, which shows a sectional view of my improved belt, l represents a layer of leather made in the ordinary manner with a vegetable tannage, which produces a well known type of leather such for instance as that employed in making the composte belt shown in Fig. l, and 2 is a section of mineral tanned leather; the two sections of vegetable and mineral tanned leather being placed with their fieslrsidcs;

in contactland secured together by cement of proper character or. other suitable means that will insure permanent connection of said leather sections for the purpose desired.

-ln preparing a three-ply belt, such as shown in Fig. 3, I pre-fer to employ a cen tral part or core l of vegetable tanned leather, which is faced on both sides with plies 2 of. mineral tanned leather'. By this construction I am enabled to produce a belt having a high degree of suppleness, and further, one that is not susceptible ofstretch; at the same time the belt so made will not crack or split; even when employed with pulleys of small size. ln some instances l may employ two layers of vegetable tanned leather with a single layer of mineral tanned leather at. one side as clearly illustrated in F ig. 4.

A composite belt which includes a ply ot' mineral tanned leather and a ply ot' vegetable tanned leather has many advantages; that is to say, the `vegetable tanned leather helps to correct the defects et' the mineral tanned leather. and the mineral tanned leather aids in correcting the defects of the Vegetable tanned leather. Mineral tanned leather when used by itselt' has a greater tendency to stretch than vegetable tanned leather because it does not have sullicient body or firmness to enable it to hold its width under tension. rlhe vegetable tamied leather, however, having firmness and great body, when cemented to the mineral tanned leather, enables the latter to hold its full Width and therefore avoid stretch.

The mineral tanned skin is materially softer than the vegetable tanned skin, and is particularly desirable for contact with the pulley when slippage is to be avoided. While this mineral tanned leather is also much tougher than the vegetable tanned..

leather, any tendency ot' the same to stretch. due to its softness, would be resisted by the section of vegetable Atanned leather to which it is firmly secured, with the result of attaining all of the advantages possessed by a belt madeof the best vegetable tanned leather, whether composite or not, while avoiding all ot' the disadvantages of the same. By reason of the supple character of the mineral tanned leather, it will have a tendency to cling more. tightly to the pulley. and therel will be very much less likelihood oi any slip occurring. ln case ot' slip, however, the danger of burning would be much less since the mineral tanned leather will stand a much higher temperature than vegetable tanned leather: probably as much as a difference of lflll" l". `Such a belt, while ha ving greater strength than a composite or double belt made of vegetable. tanned leather, will be considerably lighter in weight and thereby eft'eet economy in the load; that is to say, there will be less weight of belt to be pulled.

A great disadvantage. in connection with vegetable tanned leather belts when made of a plurality of plies is because the grain side of the belt is so apt to crack when the belt is bent, especially when passing around a small pulley. This is entirely avoided by the use of a mineral tanned skin as one of the plies or layers.

My improved composite belt will be far more supple than any double or triple composite vegetable tanned leather belt heretofore made, and hence will give better service when used in connection with small pulleys, particularly those of electric generators, and others driven at high speeds. Finally, its economy in weight with a gain in strength and efficiency of action will materially enhancev its value without increasing the cost.

To sum up, my improved composite belt. made of independent layers or 'plies of vegetable tanned l ather and minera-l tanned leather cemented together, is capable of wider use than the ordinary composite belts; it is stronger; it will not crac-k in making short turns, passing over small pulleys and the like; it will not slip when the face of mineral tanned leather is in contact with the pulley but can slip when the. vegetabletanned -leather face in contact with the pulley; and finally, while having a greater degree ot' suppleness, it will not lose its width in use, nor stretch.

l claim:

1. A composite belt made up of a section of vegetable tanned leather, and a section ot mineral tanned leather permanently secured together.

'2. A composite belt made u'p of a plurality ot' sections otI mineral tanned leather and vegetable tanned leather. permanently secured together.

3. A composite belt made up of a section of vegetable tanned leather, and a lsection of mineral tanned leather, said sections having their grain sides outermost with their flesh sides permanently secured together.

Jr. A composite belt made up ot' a section of vegetable tanned leather, and a section ot' mineral tanned leather having the flesh sides or surfaces of the same permanently cemented together.

A con'iposite belt made up of a section ot' vegetable tanned leather, and a section of mineral tanned leather permanently se cured' together, th/e section of mineral tanned leather being less in thickness thanthe section ot' vegetable tanned leather.

' In testimony whereof, I' have signed my name to this specification, in the presence of two subscribing witnesses.

oHAs. r. eARPnN'rica.

Witnesses a MURRAY C. BOYER, WM. A. BARR. 

